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Human embryology is the study of this development during the first eight weeks after fertilization. The normal period of gestation (pregnancy) is about nine months or 36 weeks. The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus .
Prenatal development (from Latin natalis 'relating to birth') involves the development of the embryo and of the fetus during a viviparous animal's gestation.Prenatal development starts with fertilization, in the germinal stage of embryonic development, and continues in fetal development until birth.
Gestational age: 2 weeks and 0 days until 2 weeks and 6 days old. 15–21 days from last menstruation. Embryonic age: Week nr 1. 0 (whole) weeks old. 1–7 days from fertilization.
First attested in English in the mid-14c., the word embryon derives from Medieval Latin embryo, itself from Greek ἔμβρυον (embruon), lit. "young one", [1] which is the neuter of ἔμβρυος (embruos), lit. "growing in", [2] from ἐν (en), "in" [3] and βρύω (bruō), "swell, be full"; [4] the proper Latinized form of the Greek term would be embryum.
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